fix: extract_youtube_id crashes on a non-string url instead of returning None (#1689)

services/youtube/youtube_handler.py

@@ -66,6 +66,8 @@ def is_youtube_url(url: str) -> bool:
 
 def extract_youtube_id(url: str) -> Optional[str]:
     """Extract YouTube video ID from various URL formats."""
+    if not isinstance(url, str):
+        return None
     parsed = urllib.parse.urlparse(url)
     if parsed.hostname in ("www.youtube.com", "youtube.com", "m.youtube.com"):
         if parsed.path == "/watch":